Which Statement Best Characterizes the Stage of Gender Consistency

Which statement best characterizes the stage of gender consistency?

A) Children recognize that boys invariably become men and girls grow up to be women.
B) Children recognize that one's understanding of gender cannot be altered by cross-dressing or taking up cross-sex activities.
C) Children first show evidence of identifying with the same-sex parent.
D) Children begin to consistently label themselves as boys or girls.